This is just a tentative idea/suggestion which I've been thinking about recently.
*I've chosen to have Tarrondar as my future heir. Prince Kree is now my current king on my side.

~Re-adjust Adult Sex Changer for older lions whether they've been patrolled or not?

~Or create a new one for older lions which have been patrolled?

Does anyone have a similar dilemma to me between the choice of two heirs and you would want both to be king after each other but you realize one might be too old to be king but you would still like the lion's lion to be continued maybe as a female? But what if that lion is too old to turned into a female? Most of the time it's just too bad one can't reach a decision in time.

As only kings and lionesses can breed, you might want cubs from that 2nd male heir but he's too old (3years or older) to be changed into a female and you would be quite happy to do so if you change your mind about your next heir/future king.

~ I'm perfectly willing to hold a future possible heir once Prince Kree on my side #32381 is king but that tactic/strategy can't always work.

~ Yes, you can hold one on your side account by not logging in until you current king on the account (side or main) you're active on is close to retirement but not if you're quite active on both nor if you don't have a side account.

Pros:
~Adjusting the existing Adult Sex Changer to work for lions older than 3 years old. With the only works if not patrolled? Or with lions patrolled doesn't matter? I guess whichever one is easier to do adjust or create a new one for older lions (maybe from about 6 years to 10)?

Cons:
~Submales are almost always patrolled so having the Adult Sex Changer as it is currently even with it working on adults older than 3 years would not work.
~The Adult Sex Changer is only for 2-3 years old adults.

What do you think?
Feel free to add any further pros or cons or any ideas/suggestions.